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prolongation (n.)

late 14c., prolongacioun, "condition of being extended;" early 15c. as "protraction, lengthening in time;" from Old French prolongacion (14c.) and directly from Medieval Latin prolongationem (nominative prolongatio), noun of action from past-participle stem of Late Latin prolongare "to prolong, extend," from Latin pro "forth" (see pro-) + longus "long" (adj.); see long (adj.).

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Definitions of prolongation from WordNet

prolongation (n.)
the act of prolonging something;
there was an indefinite prolongation of the peace talks
Synonyms: protraction / perpetuation / lengthening
prolongation (n.)
amount or degree or range to which something extends;
Synonyms: extension / lengthiness
prolongation (n.)
the consequence of being lengthened in duration;
Synonyms: lengthiness / continuation / protraction
From wordnet.princeton.edu